Anomalously hindered E2 strength B(E2;2+(1)-->0+) in 16C

Phys Rev Lett. 2004 Feb 13;92(6):062501. doi: 10.1103/PhysRevLett.92.062501. Epub 2004 Feb 12.

Abstract

The electric quadrupole transition from the first 2(+) state to the ground 0(+) state in 16C is studied through measurement of the lifetime by a recoil shadow method applied to inelastically scattered radioactive 16C nuclei. The measured mean lifetime is 77+/-14(stat)+/-19(syst) ps. The central value of mean lifetime corresponds to a B(E2;2+(1)-->0(+)) value of 0.63e(2) fm(4), or 0.26 Weisskopf units. The transition strength is found to be anomalously small compared to the empirically predicted value.